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libata-pmp-prep: implement sata_async_notification()

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AN serves multiple purposes.  For ATAPI, it's used for media change
notification.  For PMP, for downstream PHY status change notification.
Implement sata_async_notification() which demultiplexes AN.

To avoid unnecessary port events, ATAPI AN is not enabled if PMP is
attached but SNTF is not available.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Kriten Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-09-23 13:14:13 +09:00
committed by Jeff Garzik
parent e31e8531d6
commit 7d77b24708
7 changed files with 93 additions and 28 deletions
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24
drivers/ata/ahci.c
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@@ -1356,27 +1356,17 @@ static void ahci_port_intr(struct ata_port *ap)
}
if (status & PORT_IRQ_SDB_FIS) {
/*
* if this is an ATAPI device with AN turned on,
* then we should interrogate the device to
* determine the cause of the interrupt
*
* for AN - this we should check the SDB FIS
* and find the I and N bits set
/* If the 'N' bit in word 0 of the FIS is set, we just
* received asynchronous notification. Tell libata
* about it. Note that as the SDB FIS itself is
* accessible, SNotification can be emulated by the
* driver but don't bother for the time being.
*/
const __le32 *f = pp->rx_fis + RX_FIS_SDB;
u32 f0 = le32_to_cpu(f[0]);
/* check the 'N' bit in word 0 of the FIS */
if (f0 & (1 << 15)) {
int port_addr = ((f0 & 0x00000f00) >> 8);
struct ata_device *adev;
if (port_addr < ATA_MAX_DEVICES) {
adev = &ap->link.device[port_addr];
if (adev->flags & ATA_DFLAG_AN)
ata_scsi_media_change_notify(adev);
}
}
if (f0 & (1 << 15))
sata_async_notification(ap);
}
if (ap->link.sactive)